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RE2SiO5 (RE=Er, Gd, Y, Yb), Which is More Suitable for the Top-Coat of EBCs: A Problem Clarification via Finite Element Simulation Study
X.W. Sun, X.W. Sun, X. Zhong, Z.C. Hu, Y. Liu, Y. Yang, L. Wang
Abstract
As an important surface protection method, environmental barrier coatings (EBCs) have been applied in the aerospace industry. In order to prepare advanced EBCs with low residual stress, high bonding strength, excellent anti-oxidation resistance and long service lifetime by means of APS (Atmospheric Plasma Spraying), the finite element method (FEM) has been used to design and optimize the structure of the EBCs, thereby saving on experimental costs and improving investigation efficiency. The current work focuses on the influence of the top-coat layer (RE2SiO5) and the thickness of the corresponding layer on the residual stress of the EBCs. The simulation results revealed that an over-thick top-coat resulted in high residual stress and the thickness of the top-coat should not exceed 170 μm. The simulation results showed that the residual stresses in Er2SiO5 and Y2SiO5 were significantly lower than those in Yb2SiO5 and Gd2SiO5, the maximum axial stress of Er2SiO5, Gd2SiO5, Y2SiO5, Yb2SiO5 is 167 MPa, 191 MPa, 165 MPa, 294 MPa, respectively. It could be concluded that the most suitable top-coat consisted of Y2SiO5 with a thickness of 140 μm, as this produces high-quality coatings based on the current simulation results. The experiment results showed that Y2SiO5 and Er2SiO5 had fewer cracks, indicating a low stress level (142.6 MPa ±4 MPa), which was consistent with the simulation results.
Keywords
Finite element simulation, environmental barrier coating systems, residual stress, atmospheric plasma spraying, failure mechanism
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